. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian. ys yellow, or with brown bases, drooping or spreading. Involucral bracts in2 or 3 series. Disk globose, oblong or cylindric. Receptacle columnar to subulate, the con-cave chaff subtending or enveloping the disk-flowers, truncate, the tips inflexed, neutral. Disk-flowers perfect, fertile, their corollas with scarcely any tube. 474 COMPOSITAE. Vol. III. Ac
. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian. ys yellow, or with brown bases, drooping or spreading. Involucral bracts in2 or 3 series. Disk globose, oblong or cylindric. Receptacle columnar to subulate, the con-cave chaff subtending or enveloping the disk-flowers, truncate, the tips inflexed, neutral. Disk-flowers perfect, fertile, their corollas with scarcely any tube. 474 COMPOSITAE. Vol. III. Achenes short, flattened, sharp-margined, or winged, at length deciduous with the with I or 2 teeth, or none. [Name unexplained.] About 4 species, natives of North America. Type species : Rudbeckia columnaris Sims. Style-tips lanceolate-subulate; leaf-segments lanceolate; rays I-z long. i. R. short, blunt; leaf-segments linear, rays 3-is long. Disk cylindric, at length i long or more ; rays mostly as long, or longer. 2. R. columnaris. Disk globose to short-oblong, about J4 high; rays mostly short. 3. R. Tagetes. I. Ratibida pinnata (Aent.) Barnhart. Gray-headed Cone-flower. Fig. Rudbeckia pinnata Vent. Hort. Cels. pi. 71. pinnata T. & G. Fl. N. A. 2 : 314. pinnata Barnhart, Bull. Torr. Club 24: Rough and strigose-pubescent throughout; stembranched or simple, 3°-5° high. Leaves pin-nately 3-7-divided, the basal ones sometimes 10long, petioled, the segments lanceolate, dentate,cleft or entire, acute or acuminate; upper leavessessile or nearly so, the uppermost commonlysmall and entire; bracts of the involucre linearor linear-oblong, short, reflexed; rays 4-10, yel-low, l-3 long, 3-9 wide, drooping; style-tipslance-subulate; disk oblong, gray or becomingbrown, rounded, at length twice as long as thick;chaff of the receptacle canescent at the summit;achenes compressed, acutely margined, the innermargin pro
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
